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Dielectric Tunability, Expanding the Function of Metal‐Organic Frameworks
Author(s) -
Guo JiangBin,
Chen LiHong,
Ke Hao,
Wang Xuan,
Zhao HaiXia,
Long LaSheng,
Zheng LanSun
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201700425
Subject(s) - dielectric , materials science , metal , metal organic framework , electron exchange , dielectric function , ion , electron , activation energy , chemistry , optoelectronics , organic chemistry , physics , metallurgy , adsorption , quantum mechanics
Above room‐temperature dielectric tunability is observed in the metal‐organic frameworks (MOFs) [NH 2 (CH 3 ) 2 ] n [Fe III Fe II (HCOO) 6 ] n ( 1 ) and [NH 2 (CH 3 ) 2 ] n [Fe III Fe II (1 −x ) Ni II x (HCOO) 6 ] n ( x = 0.64–0.69) ( 2 ). The relative tunability (defined as [ ϵ ′ (0) – ϵ ′ (E) ]/ ϵ ′ (0) × 100% = Δϵ ′/ ϵ′ (0) × 100%) values for 1 are up to 35% (at 410 K) for E ⊥ c and 21% (at 380 K) for E ||c, while these for 2 are 14% for E ⊥ c and 11.5% for E||c . Investigation on the mechanism of the dielectric tunability in 1 and 2 reveals that the activation energy for the electron hopping between two adjacent metal ions and the magnetic exchange interaction play a key role in the dielectric tunability of these materials.